Temporal kemik fibröz displazisi

Özet

Temporal kemikte yavaş büyüyen kabarıklık, iletim tipi işitme kaybı veya tesadüfi kemik genişlemesi olan genç hastada fibröz displazi olasılığı değerlendirilir. Kontrastsız yüksek çözünürlüklü BT, intradiploik ekspansil lezyonu ve buzlu cam matriksini gösterir; temporal kemikteki yayılımı ve komşu yapıların etkilenmesini değerlendirmeye yardımcı olur. Dış kulak yolu stenozuna sekonder kolesteatom gelişebilir; temporal kemik fibröz displazisinde fasiyal kanal tutulumu da BT’de görülebilir. Paget hastalığı, osteoma veya sınırları keskin başka bir fibro-osseöz lezyonla karıştırmak ise lezyonun yayılım örüntüsünü yanlış yorumlatır.

Faz ve pencere

Kontrastsız tanısal

BT’de temporal kemikte intradiploik ekspansil lezyon ve buzlu cam matriksi değerlendirilir.

Kemik algoritması tanısal

Aksiyel ve koronal ince kesit rekonstrüksiyonlarda lezyonun dış kulak yolu, timpanik kavite, mastoid, koklea çevresi ve kafa tabanı foraminalarıyla ilişkisi gösterilir; otik kapsül korteksinin korunması ayrıca belirtilir.

BT bulguları

• Ekspansil lezyon — temporal kemikte kemik genişlemesine yol açabilir ve timpanik yarığı daraltabilir.
• Buzlu cam matriksi — intradiploik ekspansil lezyonun tümünde veya bir bölümünde görülebilir.
• Pagetoid örüntü — fibröz displazide Pagetoid/buzlu cam radyografik örüntüsü görülebilir.
• BT görünümü karma litik-sklerotik, homojen sklerotik veya ağırlıklı kistik/litik olabilir; homojen sklerotik buzlu cam örüntüsü genellikle görülür.
• Dış kulak yolu stenozu — temporal kemik fibröz displazisine eşlik edebilir; sekonder kolesteatom gelişebilir.
• Orta kulak ve kemikçik komşuluğu — lezyon orta kulağa uzanabilir; kemikçik zincirinde erozyon veya fiksasyon görülebilir.
• Otik kapsül — displastik kemik labirenti çevreleyebilir; labirenti saran yoğun kemik dokusunun korunup korunmadığı değerlendirilir.
• Kraniofasiyal fibröz displazide BT görünümü homojen sklerotik, buzlu cam paternden karma litik-sklerotik ya da ağırlıklı kistik/litik paterne değişebilir; lezyon kemiği genişletip korteksi inceltebilir.

Normalde

Fibröz displazi lezyonu labirenti çevrelese bile labirenti saran yoğun kemik doku korunabilir. Kıyaslamada kanalın daralıp daralmadığını, kemik genişlemesinin iç-dış konturunu, matriksin karşı taraf normal kemiğinden buzlu cam görünümüyle ayrılıp ayrılmadığını ve otik kapsül korteksinin korunmasını değerlendirin.

Ayırıcı tanı

Paget hastalığında kafatasında kortikal ve trabeküler kalınlaşma, kemik genişlemesi ve pamuk yünü görünümü görülebilir.

Osteoma

BT’de genellikle iyi sınırlı, homojen sklerotik ve kortekse komşu bir lezyondur.

Ossifiye fibrom

BT’de ekspansil litik lezyon veya kistik değişiklik alanları içeren solid lezyon şeklinde görülebilir.

Langerhans hücreli histiyositoz

BT’de kenarları eğimli litik lezyon görülebilir; yumuşak doku bileşeni eşlik edebilir.

Sekonder kolesteatom

dış kulak yolu stenozuna bağlı gelişebilir ve orta kulağa uzanarak kemikçik zincirinde erozyon veya fiksasyona eşlik edebilir; ekspansil buzlu cam matriks fibröz displiziyi destekler.

Tuzaklar

• Dış kulak yolu daralmasını lezyonun tek bulgusu gibi raporlamayın; kanalın gerisinde keratin birikimi, kolesteatom ve orta kulak havalanmasını ayrıca kontrol edin.
• Buzlu cam matriksi her olguda homojen değildir; karma veya pagetoid patern fibröz displaziyi dışlamaz, lezyonun genişlemesi ve kemiğe geçiş sınırıyla birlikte yorumlanır.
• Lezyonun koklea çevresini sarması otik kapsülün yıkıldığı anlamına gelmez; yoğun kortikal labirent halkasının devamlılığını ayrı takip edin.

Kendini dene

1. Temporal kemik BT’sinde buzlu cam görünümü ve dış kulak yolu stenozu birlikte en çok hangi tanıyı destekler?

   • Fibröz displazi
   • Pagetik osteopati
   • Ekzostotik osteom
   • Eozinofilik granülom
   Cevabı göster

   Fibröz displazi. Temporal kemik fibröz displazisinde BT’de buzlu cam görünümü tanıyı destekler; dış kulak yolu stenozu sık görülen bulgulardandır.

2. Fibröz displazi dış kulak yolunu belirgin daraltmış. Görüntülemede hangi eşlikçi sorun özellikle aranmalıdır?

   • Sekonder kolesteatom
   • Tegmen meningoensefaloseli
   • Ossiküler gelişim varyantı
   • Juguler foramen divertikülü
   Cevabı göster

   Sekonder kolesteatom. Kanal stenozu keratin debrisinin birikmesine ve sekonder kolesteatoma zemin hazırlayabilir; stenozun medialindeki yumuşak doku ile erozyon kontrol edilmelidir. Diğer seçenekler kanal daralmasının doğrudan sekeli değildir.

İlgili konular

• Temporal kemik Langerhans hücreli histiyositozu

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 11 cümle bu karşılaştırmada düzeltildi (2026-10-10).

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